Two-speed transmission



' Oct. 7, 193d R. T. WISE TWO-SPEED TRANSMISSION Fil ed June 6, 1928 INVENTOR. WM

A TTORNEYS.

[Patented Oct. 7, 1930 UNITED STATES PATENT OFFICE].

ROY 'r. wIsnor BERKELEY, CALIFORNIA, ASSIGNOR, RY MESNE AssIGNIIRNrsmO 1 w wIsR PATENT AND DEVELOPMENT COMPANY, OF NEW YORK, N. x, A OORPORA- I .rIoN OF DELAWARE A y t 7 'rwo-jsrnrm TRANSMISSION :Applicatioiflled June 6, 1928. Serial No. 283,247 I having an end plate 17 at its outermost end.- This end plate is formed with a removable trunnion 18 which projects inwardly through the end plate 17 to a point within the semicylindricalportion 16 of the casing. s Within the cylindrical portion 14 of the"- casing, I provide an annular inwardly proc This inventionre'latestO transmissions and v particularly pertains" to a variable speed transmission for electric'motors. I

7 It :is the principal object of the present 6 invention to provide a generally improved Qand simplified variable speed transmission for electric motors which may be directly connected to an electric motor, and'which includes a selective drivemechanism capable of driving a belt. or similar driving element 1 plurality of speeds while the motor speed remains constant. V be V v A f In carrying out the mvention into practlce,

I provide a transmission capable of being directly mounted on the motor shaft in lieu of the usual end plate at the drive end of the motor. This transmission includes a cone {pulley and a selective gear mechanism inter .mediate' 'the pulley and themotorsliaft so as j to drive the pulley either at motor speed or 7 ate speed relatively different from the motor I speed. By this simple means a considerable number of belt speeds may be obtained.

" "@Oneform which the invention ma assume I screws or other connectingelements 21. H The l internal ring gear 20 is provided with a web 22 having a bearing structure 23 at its center which embraces the motor shaft 24. The bearing structure 23 includes an antifriction bearing 25 supporting the motor shaft 24.

Arrangedconcentrically of the motor shaft and within the semi-cylindrical portion 16 of the casing is a driving element which includes a hollow cone pulley 126 embodying two pulleys 27 and 28 of different diameters."

At its outer end the conepulley '26 is fitted with abearing'29 on the trunnion 18. At its inner end the cone pulley, 26 is fitted with a i is 'exemplified'in thea following description I 9 ferredit'ormof my invention. Y

spiderstructure embodyingan inner plate 30 s and l fafi di'by w y x the and an outer plate 31 the latter of which fbp-mpanyin'g r w y which i abuts against an internal flange 32 n the end j v Fig. 1 is v .a central 1 longitudinal section ft ne pu y f mn rpl r dlsk r u a transmission embodying 30 is fitted with a bearing on the motor shaft I I, 24 to support the nnerend ofthe cone puly 26.7 A y V The inner'and outer plates 30 and 31 are rigidly connected to the inner endj'of the cone pulley 26 by means of studs or cap screws 33. Two ofthese studs or capscrewslwhich are located upon diametrically opposite sides of v Proved transmissiQnjll may be connected. In i Shaft n Spmdles uPO-n f the transmission on the 1 little 35112??? it iifalltit fii l'hefitiig 4 0 gi s z ig g i i if iiggfi the 33 which constitute the planet unit shafts so The transmiss on ll'includes a casing 12 gigg Planet umtsr W111 revolve easlly and I gheifmg @substantmuy (fyhndmcafl f 7 These planet units each comprise a gear 36 irg t smn 'A fi se ,ofthe Qasmg 1t in mesh with the internal ring gear20 and a 4 f l'm d w hem a g Whlch m y, pinion 37, which is adapted to mesh with a v if I e secur y Z l Wi s r to the sliding gear 38 splined on the motorlshaft 24'. a frameoi thelmotorilO in lieui of the usual This sliding gear 38 is also adapted/to mesh cover plate on thelmotonor with aninternal gear 39 formed on the outer dricalportion 1 ldisk 31 at the inner end of the cone pulley 26.

' Projecting fromrthe cyhn I 9 of the casing asemi-eylindrical' portion 16 y It is obvious that engagement of the sliding I .Fig. 2 is a side v levation of the transmission showing it assembled on an electric motor of a i'standardltype f g c l i .Referring more'particularly to the accomtii panying drawings, 10 indicates an electric motor of standardfdesign to which my imgear 38 with the internal gear 39 will direct- 1y connect the cone pulley to the motor shaft 24, so that the cone puley will be. driven at the same speed as the motor shaft. However, when "the sliding gear 38 is in mesh with the pinion 37'the cone pulley will be driven by means of the gear 36, driving around the sta tionary internal gear 20. In this latter oper ation, pulley will bedriveninthesame direction'as the motor shaft but at a relatively.

different rate of speed. I

To operate the sliding gear 38,I provide a control shaft 40 which extends through the by a connection 41 which permits the g'ear 38 to revolve relative to the sh'afttO.

' To operate the shaft 40, I provide a fulcrum lever 42; pivoted at one" end to a braeket43 at 1the outer endof'the transmission casing 14-.

Intermediate itsends the lever 42 is connected with the shaft lOso that oscillation of the lever 42 will be translated into reciprocation of thecont'rolshaftAO. The controlshaft 4O isprovided withisockets 4a engageableby a; spring-pressed member. 45 carried: by the trunnion 18. v I I spaced'apart so that. the member .45 will latch 30 These sockets are properly they control shaft in position',,properly positioning the sliding: gear 38 relativeto the remainder of ltscooperatingelements.f

Idesire that theoperating parts of the for this purpose I providegan oilseal at the ends ofthestru'cturewill be prevented from I 5 pass backwardly eitherwith-in the pulley 26 or-within the cylindrical portion of casing projects .throughrtheend in the. Vylindrical jporjti n of the casing 14, I providethe outer" .throu'gh passageways 46.

At the point where'th'e pulley .rdisli31fwith alsurrounding flange 4.? which is" i s. .T i ehamber with lubric'ant whic, i P? t n parts. f h ;..tncation greater 7 in 7 diameter than the opening in lthe enldof the cylindrical'portion ptthe housing through. which thelgpull'ey structure extends. felt ringt8 isinterposed between'thelflange :47 and the :eiidjwa'll of the cylindrical portion.- ."o'fkthel ousing tojprefvent lubri'ea it from, .esex

from thellousing.

As the'pulley' 26 is tense; aiiefl hai iber, w ll ,be f rm d therein an J' hin, he outerx m portion of the cjyl' a ia-li ten dfthe c av be kept su In op e. .ationitif ...ass mbl dits-idea 1s bolted to the motor frame. If "it is desired 1 wherein ,four difierentbelt speeds n1aybeob -tained:y-. '5

tram, he Sp rit the i -v n bf r fro t -Lclaimiand desireto. secure by'LetterfPate 'entisr,

. 1. A transmission comprising wagin a power shaftprojecting into the casi g,a"p1u-,

it is. ea er cted ed and the, casing 14. rality' of pulleys of v motor shaft. trunnion 18 in the outer end' of the transmis- 'sion casing.- The innerend ;of, this control shaft 40is connected tothes'liding gear-38 By shifting the" sliding gear 38 inwardly into mesh. with the pinions inthe-planet units,the planet units' will'be'driven andtheir gears 36 will'drive around theinte'rnal gear 20 and revolve the conepullcy26 in the same direction the motor": shaft but at a jrela- .tivelydiiferent rate. of speed. I 35 When the gears are so positioned two'dif- "fer ent; belt speeds may be obtained by" shifting the belt from pulley 28 to pulley 27 or vice versa. Thus, in the present transmission. by the, use of a simple.ge'armechanifsm and pulley construction, I obtain four different beltspeeds, makingthe deviceyery desirable I for use in driving machinetools' or similar machines."

. From the. foregoingjitfisobviousfithatf have provided a simple and compact transmission for "electric'motors wherein all, of the wearing parts are 'ejxp osed to. lubricationfand ,Itis obviouslthat provision. of a greater number of slidlng gears and gears on theplanet units: that. the number, of beltv speeds. maybe increased lwithoutildepartings While I haveshown the preferred for .my invention; is to -understood thatfyarious changes may be madegin ts construction by those skilled. in the art without. departing pirit of .thefinvention a uefined in theappended Having thus described mylinventlomwliat rality, of pulleyspf different'diamete relaany ofthepowershaf t, a stationary ifiternal 120 s n apnea sea ba fi lby' theip lley es ith i i r al ear, agear're et ve y fixedto said planet 'g 'ar, a gear splinedion the i l, rea h l Q i i he f lucture' needingluy power; shaft and adapted to be pl led inmesh dri e sa d ni 'l e s t m the; te 2. "A transmission comprisin r w r. haftm e t a e e t'v'ely fixed to'gether andarrang'ed ee-116th 1 45 r I erate the same.

I trically of the power shaft, an internal gear to drive the pulleys at the same speed as the power shaft.

3. A transmission comprising a casing, a power shaft projecting into the casing, a plurality of pulleys of different diameters relatively fixed together and rotatable concentrically of the'powershaft, a stationary internal gear fixed to the casing concentric of i the motor shaft, a planet gear carried by said pulleys in mesh with said internal gear, a gear V relatively fixed to the planet gear, an internal gear relatively fixed to the pulleys and disposed concentric of the power shaft, a sliding gear splined on the motor shaft and capable of operationto be placed in mesh with either 'the internal gear carried by the pulleys or the gear fixed to theplanet gear. v

4. A tTBQIlSlnlSSlOn comprising a casing, a power shaft pro ect1ng into the caslng, a plu- -rality of pulleys of different diameters relatively fixed together and rotatably supported at one end on the powershaft and at the other end on the casing, a stationary internal gear fixed to the casing concentric of the motor shaft, a planetgear carried by said pulleys in mesh with said internal gear, a gear relatively fixed to the planet gear, an internal gear relatively fixed to the pulleys and disposed concentric of the power shaft, a slidin'g gear splined on the power shaft and capable of operation to be placed in mesh with either theinternal gear carried by the pulleys or the gear fixed to the planet gear, and means disposed exteriorly of the casing and opera tively connected with said sliding gear to op- 5. A transmission comprlsing a casing, a

bearing at one end of said casing, a power shaft journalled in said bearing and pro ecting into the casing, a plurality of relatively fixed pulleys of different diameters arranged 7 within said casing in axial alignment with the 7, power shaft, said pulleys having a bearing at one end on the power shaft, a trunnionformed on the casing opposite said bearing and upon which the other end ofsaid pulleysbear, a

control shaft reciprocable through said trunnion, a stationary internal gear fixed to the casing, aplanet gear carried by said pulleys I in mesh with said internal gear, a gear fixed to the planet gear, an internal gear fixed to v the pulleys concentrically of thepower shaft,

a sliding gear splined on the power'shaft, an operative connection between said control shaft and said sliding gear whereby said sliding gear may be placed in mesh with the gear fixed to the planet gear or the internal gear carried by the pulleys by reciprocation of the control shaft.

6. A transmission comprising a casing, a hearing at one end of said casing, a power shaft projecting into the casing through said bearing, a plurality of relatively fixed pulleys of different diameters arranged within said casing in axial alignment with the power shaft, said pulleys having a hearing at one end on the power shaft, a trunnion formed on the casing opposite said bearing and upon which the other end of said pulleys bear, a control shaft reciprocable through said trunnion, a stationary internal gear fixed to the casing, a planet gear carried by said pulleys ing gear may be placed in mesh with the gear fixed to the planet gear or the internal gear carried by the pulleys by reciprocation of the control shaft, means for reciprocating said control shaft, and means for yieldably retaining the control shaft in a set osition.

R Y T. WISE. 

